Catching up to the reality already faced by many of its members, the nation’s largest teachers’ union on Monday affirmed for the first time that evidence of student learning must be considered in the evaluations of school teachers around the country, the New York Times reports. In passing the new policy at its assembly here, the 3.2 million-member union, the National Education Association, hopes to take a leadership role in the growing national movement to hold teachers accountable for what students learn–an effort from which it has so far conspicuously stood apart…